Senate Democrats have called on Attorney General William Barr to resign or face impeachment after President Donald Trump appeared to confirm that Barr had intervened in the case against the presidents longtime friend Roger Stone .

Donald Trump is shredding the rule of law in this country, Sen. Elizabeth Warren (D-Mass.) tweeted Wednesday. Congress must act immediately to rein in our lawless Attorney General. Barr should resign or face impeachment.

Sen. Richard Blumenthal of Connecticut, another Democrat, told NBC News earlier in the day that he believes Barr has no choice but to resign.

Hes acting simply as a henchman of the president, Blumenthal said.

All four federal prosecutors who ran Stones trial abruptly withdrew from the case on Tuesday after Justice Department leadership intervened to reduce their sentencing recommendation.

The prosecutors told the court on Monday that Stone should face seven to nine years behind bars for witness tampering and lying to Congress. Trump, who has leaned on Stone as an adviser since the 1980s, tweeted that the sentencing recommendation was too long and called it a miscarriage of justice.

After Trumps tweet, which was sent around 2 a.m. on Tuesday, the Justice Department signaled that it planned to revise the sentencing recommendation. The career prosecutors dropped out one by one soon after.